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TI-2025-08121 Aliases CVE-2025-8871GHSA-6wgh-rvcx-89g9

Everest Forms (Pro) <= 1.9.7 - Unauthenticated PHP Object Injection via PHAR Deserialization in Form Signature

Priority LOW 25CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
Low · Low · Low
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

The Everest Forms (Pro) plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 1.9.7 via deserialization of untrusted input in the mime_content_type() function. This makes it possible for unauthenticated attackers to inject a PHP Object. This vulnerability may be exploited by unauthenticated attackers when a form is present on the site with a non-required signature form field along with an image upload field. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present. This vulnerability is only exploitable in PHP versions prior to 8.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.003 22nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
wpeverestEverest Forms Proup to 1.9.7—No fix listedCNA
  • Everest Forms Pro Vendorwpeverest Affected up to 1.9.7 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-8871
  2. 2026-10-03 Alias added: GHSA-6wgh-rvcx-89g9

References

Other 2

  • TI-2025-00958 Everest Forms <= 3.0.9.4 - Unauthenticated Arbitrary File Upload, Read, and Deletion CVSS 3.1CRITICAL 9.8
  • TI-2026-02850 Everest Forms Pro <= 1.9.12 - Unauthenticated Remote Code Execution via Calculation Field CVSS 3.1CRITICAL 9.8
  • TI-2026-01188 User Registration & Membership <= 5.1.2 - Unauthenticated Privilege Escalation via Membership Registration CVSS 3.1CRITICAL 9.8
  • TI-2025-02262 User Registration & Membership < 4.1.3 - Authentication Bypass CVSS 3.1HIGH 8.1
  • TI-2025-02232 User Registration & Membership < 4.1.2- Unauthenticated Privilege Escalation CVSS 3.1HIGH 8.1
  • TI-2022-03588 User Registration < 2.2.4.1 - Subscriber+ Arbitrary File Upload CVSS 3.1HIGH 7.5
See all 80 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences